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Cisco CCNA Certification Broadcasts Unicasts And MulticastsWhen you begin your CCNA studies, you get hit with a lot of different networking terms right away that you might not be familiar with. What makes it a little more confusing is that a lot of these terms sound a lot alike. Here, we're going to discuss the differences between broadcasts, multicasts, and unicasts at both the Data Link (Layer 2) and Network (Layer 3) layers of the OSI model. Cisco Certification Recertifying Your CCNA and CCNP Cisco Certification: Recertifying Your CCNA and CCNP Once you get your CCNA and CCNP, you cant just rest on your accomplishment. Youve got to continue to study and add to your skill set and then.. There is a middle ground between broadcasts and unicasts, and that is a multicast. Where a broadcast will be received by all, and a unicast is received by only one host, a multicast will be received by multiple hosts, all belonging to a "multicast group". As you climb the Cisco certification pyramid, you'll be introduced to creating multicast groups and controlling multicast traffic, but for your CCNA studies you need only keep certain multicast groups in mind. Class D addresses are reserved for multicasting this range is 224.0.0.0 - 239.255.255.255. The addresses 224.0.0.0 - 224.255.255.255 are reserved for use by network protocols on a local network segment, and like broadcasts, routers will not forward these multicast packets. (Packets with these addresses are sent with a Time To Live of 1.) As a CCNA candidate, you should know that OSPF routers use the address 224.0.0.5 to send hellos, EIGRP routers use 224.0.0.10 to send updates, and RIP version 2 uses 224.0.0.9 to send routing updates. RIP version 1 and IGRP both broadcast their updates. Cisco Certification The Importance Of Building Your Own Practice Lab Cisco Certification: The Importance Of Building Your Own Practice Lab CCNAs and CCNA candidates hear it all the time: ,Get some handson experience,. From my personal experience climbing the Cisco ce.. Multicasting gets a bit more complicated as you go from your CCNA to the CCNP and CCIE, but by simply understanding what multicasting is, you go a long way toward securing the CCNA. Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of freeCCNA andCCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages. For a FREE copy of his latest e-books, ,How To Pass The CCNA, and ,How To Pass The CCNP,, visit the website and download your free copies. You can also get FREE CCNA and CCNP exam questions every day! Pass theCCNA exam with The Bryant Advantage!
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